Jerry Agreed to Show Sharon's Car to a Potential Buyer

Jerry agreed to show Sharon's car to a potential buyer.Sharon was not able to be home since she had to attend a meeting.After showing the car,Jerry left the keys in it and the car was stolen.Since Jerry was a gratuitous agent,he:

A) will only be liable for the loss of the car if his conduct constitutes gross negligence.
B) will be liable for the loss of the car if his conduct constitutes ordinary negligence.
C) has no liability for the car.
D) is strictly liable for the loss of the car.